0618 冷却剤と侵入空気の置換現象に関する研究(S45-4 原子炉システムおよびその要素技術(4),S45 原子炉システムおよびその要素技術)

概要

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Supposing loss-of-coolant and air-invasion accidents due to pipe break in very high-temperature gas-cooled reactors (VHTR), the replacement of a heavy gas and a light gas existing as inversion layers in a vessel was analyzed with the commercial CFD (Computational Fluid Dynamics) code of STAR-CD. The heavy gas flew downward in the center portion forming a plume and the light gas ascended along the wall of the vessel. Finally, as the replacement progressed, the vessel was filled uniformly with the both gases. When the width of the vessel was increased, a number of ascending and descending plumes came to appear side by side. The inversion layer replacement Ra number that was calculated for the present conditions was in a range from 6.17×10^6 to 3.01×10^7.
2007-09-07